Delta Chat alters long message text: inserts an extra space

[barkoder]

• iOS version: 15.7.x
• Device: ios and Desktop
• Delta Chat version: v2.49.2 ios and v2.49.1 Desktop
• Expected behavior: Reproduce the message that was sent.
• Actual behavior: Deltachat is randomly adding space between text.
• Steps to reproduce the problem:

1. Send the following message from Deltachat Desktop/Android to Deltachat ios.

Long message sample

-----BEGINNING OF MESSAGE-----
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a3b352b762850034fad4s
-----END OF MESSAGE-----

2. On deltachat ios, click show full message and manually select and copy the full message.

3. Open notes app. And paste the copied message in it.

4. You'll notice there is a "space" between the first and second hyphen of the first line

- ----BEGINNING OF MESSAGE-----

and the first and second hyphen of the last line

- ----END OF MESSAGE-----

5. This data corruption probably also occurs when the same long message is sent from Android to ios/Desktop, but I haven't tested that.

Why is this a problem?

When long encrypted text is sent, it fails to decrypt properly, due to the addition of that space.

[WofWca]

Thanks for the report!

Have you tried sending from Desktop to Desktop (with another profile)? I can't reproduce this, on Android things are also OK. Possibly an iOS-only issue.

[barkoder]

Yes I just reproduced the issue by sending the sample message above from Windows Desktop Deltachat to different profile on the same Windows Desktop Deltachat.

Copied and pasted the received message in Notepad++ and I got

I guess this is also a Desktop issue.

What on earth is ZWSP , and why does it get inserted ?

EDIT: Apparently ZWSP a non printing character - https://en.wikipedia.org/wiki/Zero-width_space

The zero-width space (rendered: ​; HTML entity: ​ or ​), abbreviated ZWSP, is a non-printing character used in computerized typesetting to indicate where the word boundaries are, without actually displaying a visible space in the rendered text. This enables text-processing systems for scripts that do not use explicit spacing to recognize where word boundaries are for the purpose of handling line breaks appropriately.

[barkoder]

BETTER SHORTER MESSAGE SAMPLE to trigger the bug

--------
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Here's a screen recording of me triggering the bug on DeltaChat Desktop.

deltachat_long_message_issue.mp4

[WofWca]

Thanks, I managed to reproduce this with your second sample text.
The editing is done here, in Core:

core/src/simplify.rs

Lines 4 to 18 in 7daa6cc

	/// Protects lines starting with `--` against being treated as a footer.
	/// for that, we insert a ZERO WIDTH SPACE (ZWSP, 0x200B);
	/// this should be invisible on most systems and there is no need to unescape it again
	/// (which won't be done by non-deltas anyway).
	///
	/// This escapes a bit more than actually needed by delta (e.g. also lines as "-- footer"),
	/// but for non-delta-compatibility, that seems to be better.
	/// (to be only compatible with delta, only "[\r\n|\n]-- {0,2}[\r\n|\n]" needs to be replaced)
	pub fn escape_message_footer_marks(text: &str) -> String {
	if let Some(text) = text.strip_prefix("--") {
	"-\u{200B}-".to_string() + &text.replace("\n--", "\n-\u{200B}-")
	} else {
	text.replace("\n--", "\n-\u{200B}-")
	}
	}

Maybe the solution is not to try to do this replacement for Delta Chat-generated messages even if they are long. But I'm personally not that deep into the Core internals.

Whoever has access, please transfer this issue to Core.

[link2xt]

We remove this character back here:

core/src/simplify.rs

Lines 292 to 293 in 16b65c5

	// redo escaping done by escape_message_footer_marks()
	ret.replace('\u{200B}', "")

Minimal fix is likely replacing -\u{200B}- with -- in received full text, it is unlikely that this sequence will appear in normal messages.

We can also make escaping stricter and only escape lines that are exactly -- (standard signature separator), either with zero-width space or just by removing the trailing space.